Simulation for Operation and Control of Reject Water Treatment Processes

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The recycled nutrient load of the reject water streams from solids handling is considerable, and can amount to 15-25% of the influent nitrogen load. A number of sidestream biological processes have been developed for treating the ammonia component of the reject water before returning it to the liquid train. This paper describes a plant-wide model that includes the reactions important in sidestream processes. Calibration of the model to mainstream and sidestream conditions is illustrated. Application of the model to simulation of a sidestream process pilot plant illustrates the evaluation of different operation modes and control strategies.

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